how to test industrial relay with multimeter： a step-by-step guide
Release time:2025-11-08 08:09:44
Testing industrial relays with a multimeter is a fundamental skill for anyone working with electrical circuits and automation systems. A relay is an electrically operated switch used in many industrial applications, from controlling machinery to managing electrical loads. Knowing how to test a relay ensures that it is functioning properly, preventing downtime and electrical faults. This article will guide you through the process of testing an industrial relay using a multimeter.
1. Understanding the Components of an Industrial Relay
Before diving into the testing process, it's important to understand the key components of an industrial relay. An industrial relay typically consists of three main parts：
Coil： The electromagnet that, when energized, moves the relay's switch mechanism.
NO (Normally Open) Contact： A contact that is open when the relay coil is not energized, but closes when the coil is energized.
NC (Normally Closed) Contact： A contact that is closed when the relay coil is not energized, but opens when the coil is energized.
Common Contact (COM)： This is the central point where the relay connects to the load or control circuit.
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